JP5945720B2 - Induction heating device - Google Patents

Description

  The present invention relates to an induction heating apparatus used for a general kitchen or business use that heats an object to be heated by using induction heating by a high frequency magnetic field.

  Conventionally, this type of induction heating apparatus is divided into two coils for induction heating, and in the case of an object to be heated with a large heating area, both of the divided heating coils are energized so that the object to be heated with a small heating area is heated. In such a case, one of the coils is short-circuited using a relay and energized, and the heating operation is performed by accurately detecting the presence or absence of an object to be heated (see, for example, Patent Document 1).

  FIG. 7 is a circuit configuration diagram of the conventional induction heating apparatus described in Patent Document 1. In FIG. A rectifier circuit 102 that rectifies the AC power supply 101, a heating coil 105 that heats an object to be heated, a resonance capacitor 104 that forms a resonance circuit with the heating coil 105, a drive circuit 103 that supplies a high-frequency current to the heating coil 105, The relay contact 106 for short-circuiting the heating coil 105 which divided the electromagnetic induction area mentioned later into 2 is comprised.

  FIG. 8 is a layout diagram of heating coils in the conventional induction heating apparatus described in Patent Document 1. In FIG. A first heating coil 105a for electromagnetic induction heating of a small-diameter heated object such as a pan, and a heated object having a relatively larger area than a pan such as a hot plate provided on the outer periphery of the first heating coil 105a And a second heating coil 105b for electromagnetic induction heating.

  In the above configuration, when placing an object to be heated such as a hot plate having a relatively large induction heating area, the relay contact 106 shown in FIG. 7 is opened and the first heating coil 105a shown in FIG. When the heating coil 105b is connected in series and an object to be heated such as a pot having a relatively small induction heating area is placed, the relay contact 106 is closed and the both terminals of the second heating coil 105b are short-circuited. Then, by applying a high-frequency current only to the first heating coil 105a, it is possible to appropriately switch the heating output according to the size of the induction heating area.

Japanese Patent Laid-Open No. 05-047466

  However, in the conventional configuration, the heating coil provided in two parts is short-circuited by a relay so that the object to be heated has a normal heating area such as a pan and a heating area larger than this. Although it can be used, switching of the relay is indispensable according to the heating area of the object to be heated, and there is a problem that the switching sound generated at the time of switching the relay feels troublesome for the user.

  The present invention solves the above-described conventional problems. In the heating coil configuration divided into a plurality, the inverter circuit corresponding to each heating coil is provided, and at least two heating coils are alternately arranged by the inverter circuit. It is an object of the present invention to provide an induction heating device that does not have a relay switching sound when determining the size and presence of an object to be heated.

In order to solve the conventional problems, an induction heating apparatus of the present invention includes an AC power source, a rectifier circuit that rectifies the AC power source into a direct current, a smoothing circuit that smoothes the output of the rectifier circuit and obtains a DC power source, A plurality of heating coils located below the top plate and provided to change the number of energizations according to the size of the object to be heated; and the DC power source is converted into a high frequency AC to the plurality of heating coils. A plurality of inverter circuits that inductively heat the object to be heated and correspondingly, an inverter switching unit that switches and transmits an oscillation signal to each of the plurality of inverter circuits, and an input current that detects an input current to the rectifier circuit A detection unit; a control element detection unit that detects each of electric control elements generated in the plurality of inverter circuits; an operation unit that can start a cooking menu according to an object to be heated; and the control element A control unit that receives a signal from the knowledge unit and the input current detection unit and transmits an instruction to transmit each of the plurality of inverter circuits to the inverter switching unit, and the control unit has a large bottom area of the object to be heated. When a specific cooking menu included in the operation unit to be selected is started, at least two or more heating coils are alternately energized by the inverter circuit before the heating cooking of the cooking menu is started, and the plurality of heating If the outputs of the input current detection unit and the control element detection unit corresponding to the energization of each of the coils are both within the predetermined ranges, the cooking menu is continuously heated and the bottom area of the object to be heated When a specific cooking menu included in the operation unit to be selected when the value is small is started, the inverter circuit causes one of the heating coils to be heated. Performed energized Runomi, the output of the input current detecting part corresponding to the energized said heating coil and said control element detecting unit has a configuration for starting the cooking of the cooking menu continues it is within a predetermined range Is.

Thus, since there is no relay switching sound when determining the size and presence / absence of the object to be heated, it is possible to provide an induction heating device that is convenient for the user. In addition, it is not necessary to alternately energize the plurality of heating coils, and the presence / absence and shape of the object to be heated can be determined in a short time and the operation can be shifted to the heating operation.

  Since the induction heating device of the present invention does not have a relay switching sound when determining the size of the bottom area of an object to be heated such as a pan or a hot plate, it is possible to provide an induction heating device that is convenient for the user. it can.

The block diagram when the bottom area of the to-be-heated object of the induction heating apparatus in Embodiment 1, 3, and 5 of this invention is large The block diagram in case the bottom area of the to-be-heated object of the induction heating apparatus in Embodiment 2, 3 of this invention is small External view of induction heating apparatus in Embodiments 1 to 3 of the present invention The relationship diagram of the input current and resonance voltage of the induction heating apparatus in Embodiments 1-3 of the present invention Heating coil arrangement diagram of induction heating device in embodiments 4, 6 and 7 of the present invention The flowchart of the induction heating apparatus in Embodiment 5-7 of this invention Circuit diagram of a conventional induction heating device Heating coil layout in a conventional induction heating device

A first invention includes an AC power source, a rectifying circuit that rectifies the AC power source into DC, a smoothing circuit that obtains a DC power source by smoothing the output of the rectifying circuit, and an object to be heated located below the top plate A plurality of heating coils provided so that the number of energizations can be changed according to the size of the coil, and the DC power source is converted into a high-frequency alternating current, and each of the plurality of heating coils is energized to induction-heat the object to be heated. Generated in the plurality of inverter circuits, an inverter switching unit that switches and transmits an oscillation signal to each of the plurality of inverter circuits, an input current detection unit that detects an input current to the rectifier circuit, and the plurality of inverter circuits A control element detection unit for detecting each of the electrical control elements, an operation unit that can start a cooking menu according to the object to be heated, and a signal received from the control element detection unit and the input current detection unit A control unit that transmits an instruction to cause the inverter switching unit to transmit each of the plurality of inverter circuits, and the control unit includes a specific cooking menu included in the operation unit that is selected when the bottom area of the object to be heated is large Is started, at least two heating coils are alternately energized by the inverter circuit before the start of cooking on the cooking menu, and the input current detection unit corresponding to energization of each of the plurality of heating coils, and When determining the size of the bottom area of an object to be heated such as a pan or a hot plate by continuing to start cooking on the cooking menu if both outputs of the control element detection unit are within the respective predetermined ranges. Since there is no relay switching sound, it is possible to provide an induction heating device that is convenient for the user.

The first invention, the front Symbol controller, when a particular cooking menu included in the operation unit to select if the bottom area of the object to be heated is small is started, the plurality of heating by said inverter circuit If only one heating coil of the coils is energized, and the outputs of the input current detection unit and the control element detection unit corresponding to the energized heating coil are within a predetermined range, the cooking menu is continuously heated. By starting cooking, it is not necessary to energize a plurality of heating coils alternately, and it is possible to determine the presence or absence and shape of an object to be heated in a short time and shift to a heating operation.

In a second aspect of the invention, in the induction heating apparatus of the first aspect of the invention, particularly, the induction heating apparatus includes a display unit that displays information set by the operation unit, and the control unit corresponds to the heating coil that is energized. When the outputs of the current detection unit and the control element detection unit are out of a predetermined range, heating cooking is stopped and a warning is given to the user by display or sound on the display unit. It can be notified that the object to be heated cannot be heated.

In a third aspect of the invention, in particular, in the induction heating device of the first or second aspect of the invention, the plurality of heating coils surround a central heating coil disposed in the center of the top plate and the central heating coil. By configuring with the outer heating coil provided on the outer periphery, a heating coil arrangement suitable for the shape of the object to be heated such as a pan or a hot plate is provided, so that the cooking performance can be improved.

In a fourth aspect of the invention, in particular, in the induction heating apparatus of the third aspect , when the control unit starts a specific cooking menu included in the operation unit that is selected when the bottom area of the object to be heated is large. In this configuration, the energization is performed from the central heating coil, and then the outer heating coil is energized, so that the presence or absence of an object to be heated placed in the center of the top plate can be quickly determined. Can move to non-operation.

In a fifth aspect of the invention, in particular, in the induction heating apparatus of the first aspect of the present invention, the induction heating device further includes a temperature detection unit that detects a plurality of back surface temperatures of the top plate by a plurality of temperature sensing elements, and the control unit is During heating cooking of a specific cooking menu included in the operation unit selected when the bottom area of the heated object is large, energization of each of the plurality of heating coils according to the temperature distribution of the temperature detected by the temperature detection unit By changing the ratio, soaking can be achieved, so that uneven baking can be improved.

According to a sixth aspect of the invention, in the induction heating apparatus of the first aspect of the invention, particularly during the heating cooking of the specific cooking menu included in the operation unit, the control unit is selected when the bottom area of the object to be heated is large. The heating area of the object to be heated can be switched by the operation unit, and when the heating area is switched, the energization ratio of each of the plurality of heating coils is changed, so that the user intentionally heats according to the cooking situation. Since the distribution can be manipulated, the usability can be improved.

  Hereinafter, embodiments of the present invention will be described with an induction heating apparatus as an example with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram when the bottom area of the object to be heated of the induction heating apparatus in the first embodiment of the present invention is large.

  In FIG. 1, an induction heating apparatus according to a first embodiment of the present invention obtains a direct current power source by alternating current power source 1, rectifier circuit 2 that rectifies alternating current power source 1 into direct current, and the output of rectifier circuit 2. The smoothing circuit 3, the plurality of first heating coils 5 a and the second heating coils 5 b provided below the top plate 4 and corresponding to the size of the object to be heated 15, and a direct current power source are connected to a high frequency alternating current. The first inverter circuit 6a and the second inverter circuit 6b corresponding to the plurality of first heating coils 5a and the second heating coil 5b that inductively heat the load by converting to the first inverter circuit 6a and the second inverter circuit 6a An inverter switching unit 7 for switching and transmitting an oscillation signal to the second inverter circuit 6b, an input current detection unit 8 for detecting an input to the rectifier circuit 2, a first inverter circuit 6a and a second inverter circuit The control element detection part 9 which detects each electric control element generated in b, and the plurality of first heating coils 5a and the second heating coils 5b are provided above and detect the back surface temperature of the top plate 4, respectively. The temperature detection unit 11 that detects the temperature of each of the plurality of first temperature sensing elements 10a, the second temperature sensing element 10b, and the third temperature sensing element 10c, and an operation that can start a cooking menu according to the object to be heated 15 The control unit 14 includes a display unit 13 that displays information set by the operation unit 12, and a control unit 14 that transmits signals from the control element detection unit 9 and the input current detection unit 8 to the inverter switching unit 7.

  FIG. 3 shows an external view of the induction heating device according to the first embodiment of the present invention or a second embodiment described later.

  In FIG. 3, the induction heating device according to the first embodiment of the present invention or a second embodiment to be described later has a structure in which a heated object 15 and a heated object 16 having different sizes can be placed on the same top plate 4. It has become.

  FIG. 4 shows a relationship diagram between the input current and the resonance voltage of the induction heating apparatus in the first embodiment of the present invention.

  In FIG. 4, the horizontal axis of this graph represents the input current to be input to the first inverter circuit 6a and the second inverter circuit 6b, and the vertical axis represents the electric current generated in the first inverter circuit 6a and the second inverter circuit 6b. Represents a typical control element. The first inverter circuit 6a and the second inverter circuit 6b are divided into a heatable region and a non-heatable region according to the electrical characteristics of the first inverter circuit 6a and the second inverter circuit 6b.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the heated object 15 is placed as shown in the upper part of FIG. 3, when the user selects a specific cooking menu included in the operation unit 12 that is selected when the bottom area of the heated object is large, the heated object is selected. Since it can be estimated that the object is somewhat large, the control unit 14 transmits a signal for alternately driving the first inverter circuit 6 a and the second inverter circuit 6 b to the inverter switching unit 7. The inverter circuit 6a and the second inverter circuit 6b are alternately driven.

  The heating operation of the article to be heated 15 is performed by alternately applying a high-frequency current to the first heating coil 5a and the second heating coil 5b corresponding to the first inverter circuit 6a and the second inverter circuit 6b.

When the first inverter circuit 6a and the second inverter circuit 6b are driven, the drive frequency is sequentially changed from a large frequency to a small frequency, and the drive frequency vs. input current and drive frequency vs. control element obtained at that time are obtained. The result of the above is correlated as a load operation locus, and it is determined whether the object 15 is a heated object 15 that can be heated or not heated to the final arrival point.

  In Embodiment 1 of the present invention, the heatable region and the non-heatable region of the first inverter circuit 6a and the second inverter circuit 6b are separated by different regions, but the regions vary depending on the electrical characteristics of the inverter. Therefore, it is not limited to this.

  As described above, in the present embodiment, the heating coil configuration divided into a plurality is provided with an inverter circuit corresponding to each heating coil and included in the operation unit that is selected when the object to be heated is large. When a specific cooking menu is started, at least two heating coils can be energized alternately by an inverter circuit to determine the size of the bottom area of the object to be heated. The heating coil can be operated and troublesomeness such as relay switching noise can be eliminated.

(Embodiment 2)
FIG. 2 shows a block diagram when the bottom area of the object to be heated of the induction heating device in the second embodiment of the present invention is small. 2, since it is the same structure as FIG. 1 except the to-be-heated material 16 being a pan, it abbreviate | omits.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the object to be heated 16 is placed as shown in the lower part of FIG. 3, when the user selects a specific cooking menu included in the operation unit 12 that is selected when the bottom area of the object to be heated is small, Since the object can be estimated to be small to some extent, the control unit 14 transmits a signal for driving the first inverter circuit 6a to the inverter switching unit 7, and the inverter switching unit 7 drives the first inverter circuit 6a.

  The heating operation of the article to be heated 16 is performed by applying a high frequency current to the first heating coil 5a corresponding to the first inverter circuit 6a.

  When driving the first inverter circuit 6a, the driving frequency is sequentially changed from a large frequency to a small frequency, and the driving frequency versus input current and the result of the driving frequency versus the control element obtained at that time are used as the operation locus of the load. To determine whether the object 16 can be heated with respect to the final arrival point or not.

  In the second embodiment of the present invention, the heatable region and the non-heatable region of the first inverter circuit 6a are separated by different regions, but the region varies depending on the electrical characteristics of the inverter and is thus limited. It is not a thing.

  Furthermore, in the second embodiment of the present invention, the plurality of heating coils are used as the first heating coil. However, the present invention is not limited to this, but the load is applied by the first heating coil closest to the center of the top plate 4. It is most efficient to determine the presence or absence and the shape.

  As described above, in the present embodiment, when the specific cooking menu included in the operation unit selected when the bottom area of the object to be heated is small, the inverter circuit sets the plurality of heating coils. Only one of the heating coils is energized, and when the input current detection unit and the control element detection unit are within a predetermined range, heating cooking is started. It is not necessary to energize the heating coil alternately, and the presence or absence and shape of the object to be heated can be determined in a short time and the operation can be shifted to the heating operation.

(Embodiment 3)
The configuration in this embodiment is the same as in FIGS.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the first inverter circuit 6a and the second inverter circuit 6b are driven, the drive frequency is sequentially changed from a large frequency to a small frequency, and the drive frequency vs. input current and drive frequency vs. control element obtained at that time are obtained. The results of the above are correlated as the operation locus of the load, and the heated object 15 or the heated object 16 can be heated with respect to the final arrival point, or the heated object 15 or the heated object 16 cannot be heated. Judgment is made.

  When it is determined that the region cannot be heated, the driving of the first inverter circuit 6a and the second inverter circuit 6b is stopped, and the heated object 15 and the heated object 16 are incompatible with the display unit 13 or sound. Warning.

  In Embodiment 3 of the present invention, a warning is given by voice, but not only voice but buzzer sound is possible, and the present invention is not limited to this.

  As described above, in the present embodiment, when the values of the input current and the control element are outside the predetermined ranges, it can be immediately determined that the object to be heated is incompatible with the plurality of heating coils. The user can be notified that the object is not heated visually or audibly, and the compatibility of the cooking item selected by the user and the arrangement of the object to be heated can also be confirmed. Therefore, it can prevent that the to-be-heated material 15 and the to-be-heated material 16 are heated by the incorrect cooking menu.

(Embodiment 4)
FIG. 5 shows a heating coil arrangement diagram of the induction heating apparatus in the fourth embodiment of the present invention.

  In FIG. 5, the 1st heating coil (center heating coil) 5a arrange | positioned in the center of the top plate 4 and the 2nd heating coil (outside heating coil) provided in the outer periphery so that the 1st heating coil 5a may be surrounded. ) 5b, a first temperature sensing element 10a, a second temperature sensing element 10b, a third temperature sensing element 10c for detecting the back surface temperature of the top plate, a specific cooking menu and a power on / off button. The operation unit 12 and a display unit 13 including an LED for displaying a cooking menu being selected such as fried food and grilled food, and a numerical display composed of a three-digit segment.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The first heating coil 5a disposed in the center of the top plate 4 is effective for an object to be heated whose bottom surface has a circular shape such as a water heater or a deep-fried food, and the second heating coil 5b is a hot plate or the like. This is an effective shape for a heated object having a square shape.

  Note that the heating coil in this embodiment is a combination of a circular shape and a square shape, but two or more circular heating coils or square heating coils may be arranged in parallel, and a shape such as a trapezoid or a triangle is also possible. However, the present invention is not limited to this.

  The arrangement of the first temperature sensing element 10a, the second temperature sensing element 10b, and the third temperature sensing element 10c is arranged at an intermediate position with respect to the first and second heating coils in the present invention. However, the location and quantity are not limited to this.

As described above, in the present embodiment, the heating coil arrangement is suitable for the shape of the object to be heated, such as a round shape of a pan or a quadrilateral shape of a hot plate. Since it is arrange | positioned, soaking | uniform-heating which can heat a to-be-heated material equally can be implement | achieved, and the improvement of cooking performance can be aimed at.

(Embodiment 5)
FIG. 6 shows a flowchart of the induction heating apparatus in the fifth embodiment of the present invention.

  The configuration in this embodiment is the same as in FIG. 1 or FIG.

  Hereinafter, the operation and action will be described with reference to FIG.

  In FIG. 6, when the user uses a large object to be heated and selects a specific cooking menu included in the operation unit 12 to be selected, the first heating coil (central heating coil) 5a is first energized. (Step 1), an input current and a control element (resonance voltage) corresponding to the first inverter circuit 6a are measured (Step 2).

  Subsequently, when the final arrival point becomes a heatable region by the load determination of the input current and the resonance voltage to the first inverter circuit 6a shown in the upper part of FIG. 4, the energization to the first inverter circuit 6a is stopped. (Step 3), the second heating coil (outer heating coil) 5b is energized (Step 4), and the input current and control element (resonance voltage) corresponding to the second inverter circuit 6b are measured (Step 5).

  Subsequently, when the final arrival point becomes a heatable region as a result of the load determination of the input current and the resonance voltage to the second inverter circuit 6b shown in the lower part of FIG. The first inverter circuit 6a and the second inverter circuit 6b are alternately energized to realize soaking and heating (Step 6).

  In the first and second heating coils, when heating becomes an unheatable region, heating is stopped as described in Embodiment 3 of the present invention (Step 7), and a warning is given by display or sound (Step 8). Subsequent operations will be described in Embodiment 6 and will be omitted.

  As described above, in the present embodiment, in the case of a configuration having a plurality of heating coils, energization is performed from the heating coil arranged in the center with respect to the top plate, so Since the presence or absence of heated objects can be determined in a short time, if the user accidentally places a different object to be heated or shifts the position of the object to be heated, it can be heated safely. Can be stopped.

(Embodiment 6)
The operation and action will be described below with reference to FIGS.

  In Embodiment 5, the first inverter circuit 6a and the second inverter circuit 6b are energized alternately to realize soaking, and then the first feeling shown in FIG. The temperature of the top plate 4 is measured by the temperature element 10a, the second temperature sensitive element 10b, and the third temperature sensitive element 10c (Step 9).

  At this time, the center Th is the second temperature sensing element 10b, and the outer Th is the first temperature sensing element 10a and the third temperature sensing element 10c. When the temperature at the center Th becomes lower than the temperature at the outer Th, the heat distribution becomes non-uniform, so the energization ratio of the second heating coil 5b, which is the outer heating coil, is reduced by 5% (Step 10), and the first heating is performed. Soaking is realized by increasing the energization ratio of the coil (central heating coil) 5a by 5% (Step 11).

  Conversely, if the temperature at the center Th becomes higher than the temperature at the outer Th, the heat distribution becomes non-uniform as well, so the energization ratio of the first heating coil (center heating coil) 5a is reduced by 5% (Step 12). The soaking is realized by increasing the energization ratio of the second heating coil (outer heating coil) 5b by 5% (Step 13).

  Since the operation in the case where the course is not the whole surface heating course, that is, the case where the user intentionally selects the heating area will be described in Embodiment 7, it will be omitted.

  Although the heating coil energization ratio is set to 5% in the present embodiment, the heating operation needs to be performed at an optimum energization ratio according to the state of heat distribution, and is not limited to this.

  As described above, in the present embodiment, the heat distribution of the object to be heated is detected in real time from the temperature distribution measured by the temperature sensing element, and the energization ratio of the plurality of heating coils can be freely changed to change the condition of the object to be heated. Since uniform heating that keeps the heat distribution uniform can be realized, uneven baking such as okonomiyaki and hot cake can be improved.

(Embodiment 7)
The operation and action will be described below with reference to FIGS.

  In the case where the entire heating course is not used in the sixth embodiment (Step 14), when the HP key included in the operation unit 12 shown in FIG. 5 is pressed, switching between the full mode, the center mode, and the outer mode is possible. is there.

  The full surface mode is a mode in which the first and second heating coils operate alternately. The center mode is a mode in which only the first heating coil operates. The outer mode is a mode in which only the second heating coil operates.

  As described above, in the present embodiment, since the user can intentionally manipulate the heat distribution according to the cooking situation, the baked foods are arranged side by side on the outside or in the center to prevent over baking. This can improve usability.

  As described above, the induction heating apparatus according to the present invention is equipped with a plurality of heating coils, and at the time of selecting a specific cooking menu to be selected when the bottom area of the object to be heated is large, at least two or more heating coils are alternated. It is possible to determine the presence and shape of an object to be heated, and it is effective for an induction heating apparatus for home use or business use, such as a built-in type or a stationary type used on a table.

DESCRIPTION OF SYMBOLS 1,101 AC power source 2,102 Rectification circuit 3 Smoothing circuit 4 Top plate 5a, 105a 1st heating coil 5b, 105b 2nd heating coil 6a 1st inverter circuit 6b 2nd inverter circuit 7 Inverter switching part 8 Input Current detection unit 9 Control element detection unit 10a First temperature sensing element 10b Second temperature sensing element 10c Third temperature sensing element 11 Temperature sensing unit 12 Operation unit 13 Display unit 14 Control unit 15, 16 Object to be heated

Claims (6)

AC power source, a rectifying circuit that rectifies the AC power source into direct current, a smoothing circuit that smoothes the output of the rectifying circuit to obtain a direct current power source, and is located below the top plate and according to the size of the object to be heated A plurality of heating coils provided so that the number of energizations can be changed; and a plurality of inverter circuits for inductively heating an object to be heated by converting the direct current power source into high frequency alternating current and correspondingly energizing each of the plurality of heating coils. An inverter switching unit that switches and transmits an oscillation signal to each of the plurality of inverter circuits, an input current detection unit that detects an input current to the rectifier circuit, and an electrical control element that is generated in each of the plurality of inverter circuits. The control element detection unit to detect, the operation unit that can start the cooking menu according to the object to be heated, and the inverter switch-off in response to signals from the control element detection unit and the input current detection unit A control unit that transmits an instruction to transmit each of the plurality of inverter circuits to the unit, and the control unit starts a specific cooking menu included in the operation unit that is selected when the bottom area of the object to be heated is large Then, at least two or more heating coils are alternately energized by the inverter circuit before the start of cooking on the cooking menu, and the input current detection unit and the control corresponding to energization of each of the plurality of heating coils If both the outputs of the element detection units are within the respective predetermined ranges, the cooking menu is continuously heated and the specific cooking menu included in the operation unit selected when the bottom area of the object to be heated is small Is started, only one heating coil of the plurality of heating coils is energized by the inverter circuit, corresponding to the energized heating coil. Induction heating device to start cooking the cooking menu output of fill power current detecting section and the control element detection unit continues is within a predetermined range. A display unit that displays information set by the operation unit is provided, and the control unit has outputs of the input current detection unit and the control element detection unit corresponding to the energized heating coil being out of a predetermined range. case, to stop the cooking, the induction heating apparatus according to claim 1 for warning by display or voice at said display unit. Wherein the plurality of heating coils, a central heating coil disposed in the center of the top plate, according to claim 1 or 2, composed of the outer heating coil provided on the outer periphery so as to surround the central heating coil Induction heating device. The control unit energizes from the central heating coil when a specific cooking menu included in the operation unit selected when the bottom area of the object to be heated is large, and then energizes the outer heating coil. The induction heating apparatus according to claim 3 , wherein: A temperature detection unit that detects a plurality of back surface temperatures of the top plate by a plurality of temperature sensing elements, respectively, and the control unit is included in the operation unit that is selected when the bottom area of the object to be heated is large The induction heating apparatus according to claim 1, wherein during the cooking of the cooking menu, the energization ratio of each of the plurality of heating coils is changed according to the temperature distribution of the temperature detected by the temperature detection unit. The control unit enables the heating area of the object to be heated to be switched by the operation unit during heating cooking of a specific cooking menu included in the operation unit selected when the bottom area of the object to be heated is large. The induction heating device according to claim 1, wherein when the is switched, the energization ratio of each of the plurality of heating coils is changed.